Database truncated in moving to version 10

I'm moving to a new computer and thought I'd upgrade to Biblioscape 10 in the process. I downloaded 10 and got it running in trial mode, using it to upgrade and load a copy of my database. But where my database shows 3327 entries in 8, there are only 2739 in 10 — from what I can tell, it's cut off the most recent 588 entries. Obviously, I can't live with this. I cannot see any reason for the truncation. I've tried updating a copy of the database three times and get the same result each time.

Is it an upgrade from

Is it an upgrade from version 9? Can you zip all the files under your earlier version database? I will do the upgrade here and find the problem.